Butternut Cross Pollination

Question

I have been told for years from garden masters that Butternut squash will not pollinate with another squash, yet in your article RE: Cucumbers Cross Pollinating with Squashes, you say that they do. Why is that? I have not had this happen to me as of yet and I grow zucchini and Butternut squash together for quite some time now.
With thanks.

Answer 1

This link is interesting: https://www.ipm.iastate.edu/ipm/hortnews/1996/8-23-1996/crosspol.html

This link from NCState says the same thing, but seems to be easier to understand:
http://mcdowell.ces.ncsu.edu/Cross+Pollinating+Crops/